If you were in charge of ffxiv for one day and could change anything.....

[Kaalia]

1. Add minigame area... as priority. Chocobo racing(mario-kart rip off style), <insert a throwback minigame>, giant roulette wheel, slots and tons of wonderful unlockables to purchase with your tokens/tickets.
2. Add party size adjustable dailies with adjusted rewards. Duo, 4 players, 6 players(?), 8 players etc. (each lower party one having lower rewards that scale higher as the party size gets higher, leaving every type of player to be happy while still leaving certain instance's party size what they already are. i.e; Coils of Bahamut, Crystal Tower.)
3. And of course, if it was some limitless power.. I would add more of everything. More dungeons, more jobs(specifically a support buff/dps), more skills, more gameplay depth, more races, more housing decorations etc.
That's about it.

[Kanash]

I would sell the game to the highest bidder, and GTFO of the country asap.

[TawdryClay]

Muscle sliders for ALL races and sex.. maybe I wanna be a ripped female lalafel. Also more emotes, simple sure, but I like to hug random people or lay down without having to type /emote hugs (inserts random persons name). and I would like toggle dance emote loops, sometimes I just wanna dance while I am waiting for a queue to pop without having to spam /dance motion the whole time.

Also, more hair and face varieties. While the character customization in this game is super coolies awesome, it really could have gone above and beyond, give me a few slider options eh? I like wider jawlines.

And last but not least.. MORE CLOTHES! And space for them! =D Because as a fashion hoarder I can never get enough sets of clothes to look perty in when I am standing around doing sweet eff all.

[Missmeow88]

1. I'd make Miqo'te kittens available to play (Basically Lalafell size, just because of the cuteness)

2. Chocobobreeding / racing

3. Butt slide. (I don't see the need for a package slide, but I guess that can be thrown in?)

4. I'd make Miqo'te ears more catish. (because of cuteness)

[RoosterAgathos]

Add a side quest to break your bond with gear.

Make it a dark, black market/underbelly of uldah sort of thing. A purchase of an item with myth or philo would be a good hurtle from everyone doing it constantly.

while I am at it whole black market section to uldah in general

[Cojika]

1. I would make an item that allowed you to make unicorn mounts explode when you target use the item on one, sending the rider flying off dramatically with ragdoll physics and permanently killing the mount.
2. Anyone who used the words yolo, swag, lel or any other terrible combination would burst into flames which would last x amount of time(the timer got higher for each consecutive use of these words, going as high as 96 hours), the flames would kill them, and they persisted through death.
3. Vote kick
4. A punishment system for toxic players, voted by the community as to whether or not they should be punished or not. Same thing as league's tribunal.
5. Add Fat Chocobo as a epic primal fight
6. A method of detecting botters/rmt into the client, these players would then be flagged for pvp. When killed they would be kicked out of the game not be able to log in while they were investigated.
7. Make the rmt special task force competent

[Swear_Bear]

1. Stop mobs from leashing.
2. Add non-fate HNMs (Vrtra, Tiamat, etc) to roam a perimeter.
3. Set a limit on FATE exp, so PLAYERS LEARN TO PLAY THEIR JOBS IN DUNGEONS
4. Fix server lag issues.
5. Turn everyone into a Roegadyn.

[Catrim]

Um... what?

So... you want to replace fates, an event where monsters spawn, and sometimes NPCs, and players must fight them and/or protect something... with an event where monsters spawn, sometimes NPCs, and players must fight them and/or protect something...? Fates ARE campaign battles.

That's like saying chicken pot pie and chocolate pie are the same thing because they're both pie.

[diulalasing]

Delete DRG loots from Coil

[Tiggy]

That's like saying chicken pot pie and chocolate pie are the same thing because they're both pie.

A better analogy would be a apple pie with a lattice top and an apple pie with a solid top. Both are still apple pies but have slightly different presentation.